Retransmission indication

Abstract

Apparatuses, methods, and systems are disclosed for retransmission indication. One apparatus includes a receiver that receives a first reference signal transmitted on a first set of resource elements from a device. The first reference signal is associated with a first data. The apparatus also includes the receiver receiving a second reference signal transmitted on a second set of resource elements from the device. The second reference signal is associated with a second data, and the first data and the second data may be different redundant versions of data.

Description

FIELD[0001]The subject matter disclosed herein relates generally to wireless communications and more particularly relates to retransmission indication.BACKGROUND[0002]The following abbreviations are herewith defined, at least some of which are referred to within the following description: Third Generation Partnership Project (“3GPP”), Positive-Acknowledgment (“ACK”), Binary Phase Shift Keying (“BPSK”), Clear Channel Assessment (“CCA”), Cyclic Prefix (“CP”), Channel State Information (“CSI”), Common Search Space (“CSS”), Downlink Control Information (“DCI”), Downlink (“DL”), Downlink Pilot Time Slot (“DwPTS”), Enhanced Clear Channel Assessment (“eCCA”), Evolved Node B (“eNB”), European Telecommunications Standards Institute (“ETSI”), Frame Based Equipment (“FBE”), Frequency Division Duplex (“FDD”), Frequency Division Multiple Access (“FDMA”), Guard Period (“GP”), Hybrid Automatic Repeat Request (“HARQ”), Licensed Assisted Access (“LAA”), Load Based Equipment (“LBE”), Listen-Before-Ta...

AI Technical Summary

Benefits of technology

The patent describes apparatuses and methods for retransmission indication. These apparatuses and methods allow a device to receive two reference signals, one associated with a first data and another associated with a second data. The first and second data may be different redundant versions of data. The apparatuses and methods also allow the device to indicate which data was sent in a previous transmission and which data was sent in a retransmission. This helps the device to accurately receive and process the data. The technical effects of this patent include improved data transmission and reliability.

Problems solved by technology

Nevertheless, if the grant-free UL transmission is directly introduced, it may result in problems with eNB reception due to the eNB not being aware of time-frequency resources, a modulation and coding scheme (“MCS”), HARQ process identification (“ID”), redundancy version (“RV”), and / or new data indicator (“NDI”), and so forth for a transmitting UE.

Without the information of time-frequency resources, the eNB may blindly detect each possibility of resource usage.

Such blind detection may result in excessive complexity and may use too much processing time.

However, this simplified eNB implementation sacrifices the potential performance gain due to link adaptation and flexibility.

In some configurations of NOMA, without retransmission and combination one-shot transmission may not ensure performance.

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